But what about "whosoever shall call on the name of the Lord shall be saved?
Indeed. We all affirm wholeheartedly that "whosoever calls on the name of the Lord will be saved." and that is what we declare to all men; but therein lies the difficulty. Are men ever found naturally willing to submit to the humbling terms of the gospel of Christ? "Whosoever will" it is a conditional statement asserts nothing indicatively. Statements like "believe the gospel", "whosoever will", "if thou art willing", "if thou hear", "if thou do" declare, not man's ability, but his duty. By failing to see this It appears you are confusing imperatives (commands) with indicatives (what God does for us). By doing so you end up ignoring half of the Bible which gives you the content to read this in.... the Bible which declares "whosoever will" also asserts that no man will come to Christ unless God grants it (John 6:65). And all those He grants will come (John 6:37) We indiscriminately call all men to believe the gospel but the Bible also teaches that no one will come apart from grace.
Synergists teach that 'salvation depends on human will', but the Bible teaches that (and I quote) 'it depends not on human will or exertion, but on God, who has mercy." (Rom 9:16)
Synergists teach '... and as many as believed were ordained to eternal life.' but The Bible teaches (and I quote) 'AND AS MANY AS WERE ORDAINED TO ETERNAL LIFE BELIEVED.' (Acts 13:48)
Synergists teach that 'you are not Christ's sheep because you do not believe', but Jesus teaches that 'you do not believe because you are not of My sheep.' (John 10:26)
Many seem to invert this clear biblical order. Grace is not a reward for faith, but the cause of it. To invert this is to confuse imperatives and indicatives. By doing so you end up ascribing your repenting and believing to your own wisdom, humility, sound judgment and good sense and not to Christ alone. Then it becomes, not a gospel of grace, but of meeting conditions in order to win God's grace. That is nothing less than salvation by merit.